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The AAPG/Datapages Combined Publications Database

GCAGS Transactions


Gulf Coast Association of Geological Societies Transactions
Vol. 47 (1997), Pages 485-491

Salt Geometry and Subsalt Trapping in the Enchilada Area, NE Garden Banks, Offshore Louisiana

Brad A. Robison (1), Rocco Detomo Jr. (1), R. David Garner (1), Arie Speksnijder (1), Michael J. Styzen (1)


Significant discoveries have been made in the Flex Trend, northeastern Garden Banks, at Prospects Enchilada, GB 128 #1, Salsa, GB 172 #1, and Chimichanga, GB 127 #1. Hydrocarbons in Pliocene age, upper slope channelized turbidite sands are located adjacent to and below a major tabular salt mass. Increased confidence in subsalt trap definition relies heavily on integrating fundamental geologic observations into interpretation of a proprietary 3-D prestack depth migrated seismic data set. Key observations include: suprasalt faults that strike parallel to a base salt "keel", morphological differentiation of the salt body from updip tabular salt, approximately 50 m of inverted and repeated condensed section below tabular salt defined by biostratigraphic evaluation, a "faceted" base salt surface characterized by abrupt changes in dip direction, and a more deeply buried regionally extensive salt evacuation surface.

Integration of data yields interpretations far more complex than initially proposed. Traps are primarily fault controlled with a significant stratigraphic overprint. These controlling faults are related to deeper salt evacuation and are not strongly expressed above the tabular salt level. The overlying salt body appears comprised of several independent and separately rooted salts. One of the salt roots and the associated base salt keel provide part of the updip trap for subsalt reserves.

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